54 
BULLETIN 1136, U, & DEPARTMENT OF AGRICULTURE. 
f urnisli support to the lumber during drying so that it will be as 
straight as possible when dry. 
For drying in a progressive kiln, the lumber is always loaded on 
trucks or bunks and run through the kiln on rails, which are usually 
pitched down toward the dry end, so that gravity will assist in mov- 
Large compartment kilns are usually provided 
»■ the trucks. 
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Fig. 11,-— Cross section of superheated-steam compartment kiln. 
with rails, so that the lumber can be run in or, trucks; but many 
small kilns have no such provisions, and the lumber is piled on 
horses or other supports. 
The two general kinds of piling used for lumber are vertical or 
edge piling, and horizontal or flat piling. Each of these may be 
divided into cross and end piling. In cross piling, the boards run 
crosswise of the kiln, and in end piling they run lengthwise of the 
kiln. 
